Curve-drawing apparatus.



I e. CARON. CURVE DRAWING APPARATUS.

APPLICATION FILED FEB. 8,1918.

1,285, 61 6. Patented Nov. 26, 1918.

k llllllllll lllllEYI/{fifi/MIIII/III IIIII/I/ I I f I I f I I I U INVENT'OR adjusted in length. A templet' having a. periphery of the desired oval or-other. shape. is secured to the spindle and forms-a gu1d-. ing means for a member whichis caused to UNITED STATES PATENT QFFTQE...

GEORGE GABON, OF BROOKLYN, NIEVWYORK.

GURVEPDRAWIN G APPARATUS.

Application filed February 8, 1918. Serial No. 216,002.-

To all whom it may concern Be it known that I, Gnonon. CARON, a citizen of theUnited States, residing 1n the borough of Brooklyn, countyof Kings,

and State of New York, have invented'certain new and useful Improvementsin Curve- Drawing Apparatus, of which the following is a specification.

My invention relates to apparatusforaccurately drawing ellipses orothen desiredcurves of greater or lessdimensions and my:

object is to providedevices of this character which shall be e-flicient,.simple and easily. manipulated. In carrying out my inven-.-. tion I provide a central spindle or'supportwhich preferably is provided with a firm tripod base and whichpreferablymay be travel around the periphery of the templet in-firm contact therewith during the opera-.

This memberis: con-. nected-to the operating handle by a pivotedsliding connection such .as .a sleeve and plunger connection, preferably, having. an interposed spring, so that the member. may:-

tion of the device.

constantly be held in contact with'its track,

which preferably is formed. by turning up-.. wardly the edge ofthe' templet. Thedrawing instrument, either a pen or a pencil, is.

connected to the member which/travels around the templet by. pivoted connections in which provision is made for-longitudinal; adjustment so that curves of'greater or less:

dimensions maybe drawn. Preferablypro: vision is-made so that: a pair of markers may be carriediby the connectionsifdesired: todraw parallel spaced curves at the same. time.

In order that a clearer understandingofix.

my invention may be had attention is hereby calledto the accompanyingdrawings forming part of this application and illustrating Y the preferred embodiment ofmy invent on;

in the drawings Figure 1 representsa front elevation of my device .certainparts being.

shown in section, and thei narkers'andconnecting arm being shown 1n.-dotted lmes m a second-position, Fig. 2 represents. :a hori-l zontalisection taken on line 2.2 of Fig. 1

andFig. 3 is a section taken on line 3.3 of:

Fig. 1.

Referringto the drawings thecentralsup-. port. comprises a verticahspindle 1 having Specification of Letters Patent. p t t m 3, 1 3

an enlargement 2 at its upper end. A curved: s templet: 3vrests on the plan-e upper surface of the enlargement 2 and is firmly secured thereto. Preferably the enlargement 2 is provided at its central point with an upwardly extending screw 1 which is adapted to be passed through a central opening in templet3, and screwed into a screw-threaded opening in the enlargement fiat the'lower end of the upper spindle member 5, so 'that the templetis firmly clamped between the enlarged portions 2 and 6 of'members- 1 and 5. Dowel'pins 4 may also be used extending into the templet from enlargem-entQ or 6. Theivertical support preferably has an adjustablebase as shown in the drawings inwhichspindle 1 is provided at its lower I end with an QXtGHSlOII-TlidVlIlgTfiCk-tGGtll thereonand terminating in a sharp pointed portion. 7'; sleeve 8 provided at its lower end with a Member 7 passes through a plurality, such as three ofdownwardly and 1 outwardly slanting SHPPOrting-membersQ having pointed lower ends to form a tripod base adapted tofirmly support the device in vertical position upon thev drawingboardzx' Sleeve-.8 carries a small pinion 10 which engages withitherack-teeth on extension? andisoperableby a smallknob or handle 11. Inoperation, point 7 is first placed atuthe desiredicenter, with points 9=out of. contact .with the-paper.- Knob ll is then turned to.

bring sleeve 8 down, to cause the three steel points 9 to press intothe paper, and forma firm, level-support for the device.

The extension 50f the spindle is provided at-its upper portion with a suitable bearing surfacesuch as the ball 12 from which ex-.

tends upwardly a cylindrical portion 13 of reduced diameter.

hingedto disk 15 as shown at 16. Member gers of. the operator, such as a knurledsurr.

face asshown.

Thetemplet 3 has its outer edge accu-Z'. rately formed to the desired curvaturesuch I as an oval, the outer edge beingturned up,

as shown at 17, to form a track. The member 18 comprises a body-portion having an inclined slot therein adapted to slidably en gage the up turned edge 17 of the templet. Member 18 has hinged thereto, as shown at 18 an upwardly and inwardly slanting extension in the form of a sleeve 19 within Which the lower end of arm 16 slidably engages. A coiled spring 20 is preferably mounted within sleeve 19 between the lower end of arm 16 and the bottom of the sleeve opening. The result of this construction is that as handle ll is rotated member 18 will travel around track 1? in firm contact therewith, arm 16 moving in and out of sleeve 19 as the curvature of track 17 varies, spring 20 serving to always press member 18 firmly against the inner surface of track 17.

Member 18 is provided with a downwardly directed extension below the edge of the templet, provided at its lower end wi h an upwardly directed slot in which may be inserted the tongue 21 of a member adapted to form a hinge for the marking instru ment. A member 23 is hinged to member 22, in well known manner such as the tongue and groove construction illustrated, and is provided at its lower end with a slot in which the tongue 2 1 of member 25 may be secured by the adjusting screw 26. Tongue 21 may be similarly held in position by a screw 21.

Member 25 is preferably provided with a central opening extending upwardly from its lower end in which is slidably mounted a member 27 having rack-teeth formed thereon. A small pinion 28 is mounted on a shaft supported in the walls of member 25 and engages the teeth of member 27 to raise or lower the same in the opening in member 25.

Member 27 is provided at its lower end with a slot in which is mounted the upwardly extending tongue of the member 30, the tongue being secured in position by an adjusting screw 31. Member 30 has pivotally secured thereto, as shown at 32, a suitable drawing instrument as for example the pen 33. Preferably a pair of similar marking instruments 33 and 34 are pivoted to member 30 at 32 by an appropriate tongue and groove pivotal connection, so that parallel curves may be drawn if desired.

The operation of the device will now become plain. The drawing instruments 33 and 34 are illustrated in Fig. 1 in full lines as adjusted to draw ovals of reduced dimensions in relation to the size of templet 3 and. in dotted lines the instruments are shown adjusted to draw ovals of an enlarged size. The hand-wheel 29 must, of course, be turned to extend members 27 and 30 when a curve of greater dimensions is to be drawn. Both drawing instruments are used when parallel curves are to be drawn and one of the in struments may be swung up about its pivotal connection when a single curve only is to be drawn. The construction is such that member 18 necessarily travels in accurate engagement with track 17 at all times. The apparatus may very readily be taken apart or set up as will be observed.

Having described invention what I claim as new therein and desire to secure by Lett r Patent of the United States is:

1. In a curve-drawing apparatus the combination of a vertical axial support, a curved templet carried thereby, a member adapted to travel around the periphery of said templct, and having an upwardly and inwardly extending projection, a drawing instrument secured to said member, a member rotatable about said support, having a portion slidably engaged with said projection, for relative movement lengthwise thereof, and adapted to drive said projection about said templet, and spring means between said members to constantly hold said first memer in contact with the edge portion of said templet, substantially set forth.

2. In a curve-drawing apparatus the combination of a vertical axial support, a horizontal templet carried thereby, having a curved track thereon, a member adapted to travel on said track, having an upwardly and inwardly inclined sleeve portion, a drawin instrument secured to said member, and a member rotatable about said vertical support, having an outwardly and downwardly inclined portion slidably engaged within said sleeve portion, substantially as set forth.

3. In a curve-drawing apparatus the combination of a vertical axial support having a pointed lower end, a horizontal templet carried thereby, having a curved track thereon, a member adapted to travel on said track, a drawing instrument, pivoted connections between said member and said instrument, a sleeve surrounding the lower portion of said axial support, carrying outwardly and downwardly extending supporting points, means for adjusting the position of said sleeve to cause said points to engage the surface on which the apparatus is mounted, and means for rotating said memher about said track, and holding the same in firm contact therewith during rotation, substantially as set forth.

4. In a curve-drawing apparatus the combination of a vertical axial support, a horizontal templet carried thereby, having a curved track thereon, a member adapted to travel on said track, a drawing instrument, pivotal connections between said member and instrument, a manually-operable member, and pivoted and sliding connections between the same and said first member for rotating said first member about said track, and holding the same in firm contact there with during rotation, substantially as set forth.

5. In a curve-drawing apparatus the combination of a vertical axial support, a horizontal templet carried thereby, having a curved track thereon, a member adapted to travel on said track, a pair of drawing instruments, adapted to draw parallel curves, connections between said member and instruments, having pivotal connections with said member, and with said instruments, adjustment means for permitting said instruments to be engaged with the sheet to .be drawn upon, in various positions, and

means for rotating said member about said track, substantially as set forth.

6. In a curve-drawing apparatus the combination of a vertical axial support, a horizontal templet carried thereby, having a curved upwardly extending track thereon, a member engaging said track, having an upwardly extending sleeve portion hinged thereto, a drawing instrument secured to said member, a manually-operable member mounted to rotate about said support, above said templet, having a downwardly extending plunger hingedly connected therewith, slidably engaged within the sleeve-portion of said first member, and a spring within said sleeve-portion en a in said plunger and acting on said fii st m mber, to hold said first member at all times firmly engaged with its track, substantially as set forth.

7. In a curve-drawing apparatus the combination of a vertical axial support having an enlarged bearing surface on its upper end, a horizontal templet secured thereon, having a curved track thereon, a second support secured on said templet in alinement with the first support, having a hearing surface, and a cylindrical extension above the same, a manually-operable vertical member rotatably mounted on said extension, having a horizontal portion at its lower end mounted on said last-named bearing surface, a member adapted to travel on said track, a drawing instrument secured thereto, and telescoping connections between said traveling member and said horizontal portion of the manually-operable member, substantially as set forth;

This specification signed and witnessed this 18th day of January, 1918.

GEORGE GABON. Witnesses:

Dyan SMITH, I. MoIN'rosH;

copies of this patent may be obtained for five cents each, by addressing the "Commissioner 0! Pstents, Washington, D. 0." 

